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source: fedd/fedd_client.py @ f3d72f7

axis_examplecompt_changesinfo-opsversion-1.30version-2.00version-3.01version-3.02 version-1.0

Last change on this file since f3d72f7 was f3d72f7, checked in by Ted Faber <faber@…>, 15 years ago
Hacks to get default certs to work for terminate and the info requests.
Property mode set to `100755`
File size: 20.9 KB

Line
1	#!/usr/local/bin/python
2
3	import sys
4	import os
5	import pwd
6
7	from federation import fedid, service_error
8	from federation.util import fedd_ssl_context, pack_id, unpack_id
9	from federation.remote_service import service_caller
10
11	from optparse import OptionParser, OptionValueError
12
13
14	class IDFormatException(RuntimeError): pass
15
16	class access_method:
17	"""Encapsulates an access method generically."""
18	(type_ssh, type_x509, type_pgp) = ('sshPubkey', 'X509', 'pgpPubkey')
19	default_type = type_ssh
20	def __init__(self, buf=None, type=None, file=None):
21	self.buf = buf
22
23	if type != None: self.type = type
24	else: self.type = access_method.default_type
25
26	if file != None:
27	self.readfile(file)
28
29	def readfile(self, file, type=None):
30	f = open(file, "r")
31	self.buf = f.read();
32	f.close()
33	if type == None:
34	if self.type == None:
35	self.type = access_method.default_type
36	else:
37	self.type = type;
38
39	class node_desc:
40	def __init__(self, image, hardware, count=1):
41	if getattr(image, "__iter__", None) == None:
42	if image == None: self.image = [ ]
43	else: self.image = [ image ]
44	else:
45	self.image = image
46
47	if getattr(hardware, "__iter__", None) == None:
48	if hardware == None: self.hardware = [ ]
49	else: self.hardware = [ hardware ]
50	else:
51	self.hardware = hardware
52	if count != None: self.count = int(count)
53	else: self.count = 1
54
55	class fedd_client_opts(OptionParser):
56	"""Encapsulate option processing in this class, rather than in main"""
57	def __init__(self):
58	OptionParser.__init__(self, usage="%prog [opts] (--help for details)",
59	version="0.1")
60
61	self.add_option("-c","--cert", action="store", dest="cert",
62	type="string", help="my certificate file")
63	self.add_option("-d", "--debug", action="count", dest="debug",
64	default=0, help="Set debug. Repeat for more information")
65	self.add_option("-s", "--serializeOnly", action="store_true",
66	dest="serialize_only", default=False,
67	help="Print the SOAP request that would be sent and exit")
68	self.add_option("-T","--trusted", action="store", dest="trusted",
69	type="string", help="Trusted certificates (required)")
70	self.add_option("-u", "--url", action="store", dest="url",
71	type="string",default="https://localhost:23235",
72	help="URL to connect to (default %default)")
73	self.add_option("-x","--transport", action="store", type="choice",
74	choices=("xmlrpc", "soap"), default="soap",
75	help="Transport for request (xmlrpc\|soap) (Default: %default)")
76	self.add_option("--trace", action="store_const", dest="tracefile",
77	const=sys.stderr, help="Print SOAP exchange to stderr")
78
79	class fedd_create_opts(fedd_client_opts):
80	def __init__(self, access_keys, add_key_callback=None,
81	add_cert_callback=None):
82	fedd_client_opts.__init__(self)
83	self.add_option("-e", "--experiment_cert", dest="out_certfile",
84	type="string", help="output certificate file")
85	self.add_option("-E", "--experiment_name", dest="exp_name",
86	type="string", help="output certificate file")
87	self.add_option("-F","--useFedid", action="store_true",
88	dest="use_fedid", default=False,
89	help="Use a fedid derived from my certificate as user identity")
90	self.add_option("-f", "--file", dest="file",
91	help="experiment description file")
92	self.add_option("-p", "--project", action="store", dest="project",
93	type="string",
94	help="Project to export from master")
95	if add_key_callback:
96	self.add_option("-k", "--sshKey", action="callback", type="string",
97	callback=add_key_callback, callback_args=(access_keys,),
98	help="ssh key for access (can be supplied more than once")
99	if add_cert_callback:
100	self.add_option("-K", "--x509Key", action="callback",
101	type="string", callback=add_cert_callback,
102	callback_args=(access_keys,),
103	help="X509 certificate for access " + \
104	"(can be supplied more than once")
105	self.add_option("-m", "--master", dest="master",
106	help="Master testbed in the federation")
107	self.add_option("-U", "--username", action="store", dest="user",
108	type="string", help="Use this username instead of the uid")
109
110	class fedd_split_opts(fedd_create_opts):
111	def __init__(self, access_keys, add_key_callback=None,
112	add_cert_callback=None):
113	fedd_create_opts.__init__(self, access_keys, add_key_callback,
114	add_cert_callback)
115	self.add_option('-t','--fedkit', action='store_true', dest='fedkit',
116	default=False,
117	help="get output suitable for federation kit install")
118
119
120	class fedd_access_opts(fedd_create_opts):
121	def __init__(self, access_keys, node_descs, add_key_callback=None,
122	add_cert_callback=None, add_node_callback=None):
123	fedd_create_opts.__init__(self, access_keys, add_key_callback,
124	add_cert_callback)
125	self.add_option("-a","--anonymous", action="store_true",
126	dest="anonymous", default=False,
127	help="Do not include a user in the request")
128	self.add_option("-l","--label", action="store", dest="label",
129	type="string", help="Label for output")
130	if add_node_callback:
131	self.add_option("-n", "--node", action="callback", type="string",
132	callback=add_node_callback, callback_args=(node_descs,),
133	help="Node description: image:hardware[:count]")
134	self.add_option("-t", "--testbed", action="store", dest="testbed",
135	type="string",
136	help="Testbed identifier (URI) to contact (required)")
137
138	class fedd_exp_data_opts(fedd_client_opts):
139	def __init__(self):
140	fedd_client_opts.__init__(self)
141	self.add_option("-e", "--experiment_cert", dest="exp_certfile",
142	type="string", help="output certificate file")
143	self.add_option("-E", "--experiment_name", dest="exp_name",
144	type="string", help="output certificate file")
145
146	def exit_with_fault(dict, out=sys.stderr):
147	""" Print an error message and exit.
148
149	The dictionary contains the FeddFaultBody elements."""
150	codestr = ""
151
152	if dict.has_key('errstr'):
153	codestr = "Error: %s" % dict['errstr']
154
155	if dict.has_key('code'):
156	if len(codestr) > 0 :
157	codestr += " (%d)" % dict['code']
158	else:
159	codestr = "Error Code: %d" % dict['code']
160
161	print>>out, codestr
162	print>>out, "Description: %s" % dict['desc']
163	sys.exit(dict.get('code', 20))
164	# Base class that will do a the SOAP/XMLRPC exchange for a request.
165	class fedd_rpc:
166	class RPCException:
167	def __init__(self, fb):
168	self.desc = fb.get('desc', None)
169	self.code = fb.get('code', -1)
170	self.errstr = fb.get('errstr', None)
171
172	def __init__(self, pre):
173	"""
174	Specialize the class for the pre method
175	"""
176	self.RequestBody="%sRequestBody" % pre
177	self.ResponseBody="%sResponseBody" % pre
178	self.method = pre
179
180	self.caller = service_caller(self.method)
181	self.RPCException = fedd_rpc.RPCException
182
183
184	def add_ssh_key(self, option, opt_str, value, parser, access_keys):
185	try:
186	access_keys.append(access_method(file=value,
187	type=access_method.type_ssh))
188	except IOError, (errno, strerror):
189	raise OptionValueError("Cannot generate sshPubkey from %s: "\
190	"%s (%d)" % (value,strerror,errno))
191
192	def add_x509_cert(self, option, opt_str, value, parser, access_keys):
193	try:
194	access_keys.append(access_method(file=value,
195	type=access_method.type_x509))
196	except IOError, (errno, strerror):
197	raise OptionValueError("Cannot read x509 cert from %s: %s (%d)" %
198	(value,strerror,errno))
199	def add_node_desc(self, option, opt_str, value, parser, node_descs):
200	def none_if_zero(x):
201	if len(x) > 0: return x
202	else: return None
203
204	params = map(none_if_zero, value.split(":"));
205
206	if len(params) < 4 and len(params) > 1:
207	node_descs.append(node_desc(*params))
208	else:
209	raise OptionValueError("Bad node description: %s" % value)
210
211	def get_user_info(self, access_keys):
212	pw = pwd.getpwuid(os.getuid());
213	try_cert=None
214	user = None
215
216	if pw != None:
217	user = pw[0]
218	try_cert = "%s/.ssl/emulab.pem" % pw[5];
219	if not os.access(try_cert, os.R_OK):
220	try_cert = None
221	if len(access_keys) == 0:
222	for k in ["%s/.ssh/id_rsa.pub", "%s/.ssh/id_dsa.pub",
223	"%s/.ssh/identity.pub"]:
224	try_key = k % pw[5];
225	if os.access(try_key, os.R_OK):
226	access_keys.append(access_method(file=try_key,
227	type=access_method.type_ssh))
228	break
229	return (user, try_cert)
230
231	def do_rpc(self, req_dict, url, transport, cert, trusted, tracefile=None,
232	serialize_only=False):
233	"""
234	The work of sending and parsing the RPC as either XMLRPC or SOAP
235	"""
236
237	context = None
238	while context == None:
239	try:
240	context = fedd_ssl_context(cert, trusted)
241	except Exception, e:
242	# Yes, doing this on message type is not ideal. The string
243	# comes from OpenSSL, so check there is this stops working.
244	if str(e) == "bad decrypt":
245	print >>sys.stderr, "Bad Passphrase given."
246	else: raise
247
248	if transport == "soap":
249	if serialize_only:
250	print self.caller.serialize_soap(req_dict)
251	sys.exit(0)
252	else:
253	try:
254	resp = self.caller.call_soap_service(url, req_dict,
255	context=context, tracefile=tracefile)
256	except service_error, e:
257	raise self.RPCException( {\
258	'code': e.code,
259	'desc': e.desc,
260	'errstr': e.code_string()\
261	})
262	elif transport == "xmlrpc":
263	if serialize_only:
264	ser = dumps((req_dict,))
265	print ser
266	sys.exit(0)
267	else:
268	try:
269	resp = self.caller.call_xmlrpc_service(url, req_dict,
270	context=context, tracefile=tracefile)
271	except service_error, e:
272	raise self.RPCException( {\
273	'code': e.code,
274	'desc': e.desc,
275	'errstr': e.code_string()\
276	})
277
278	else:
279	raise RuntimeError("Unknown RPC transport: %s" % transport)
280
281	if resp.has_key(self.ResponseBody):
282	return resp[self.ResponseBody]
283	else:
284	raise RuntimeError("No body in response??")
285
286	# Querying experiment data follows the same control flow regardless of the
287	# specific data retrieved. This class encapsulates that control flow.
288	class exp_data(fedd_rpc):
289	def __init__(self, op):
290	"""
291	Specialize the class for the type of data requested (op)
292	"""
293
294	fedd_rpc.__init__(self, op)
295	if op =='Vtopo':
296	self.key="vtopo"
297	self.xml='experiment'
298	elif op == 'Vis':
299	self.key="vis"
300	self.xml='vis'
301	elif op == 'Info': pass
302	else:
303	raise TypeError("Bad op: %s" % op)
304
305	def print_xml(self, d, out=sys.stdout):
306	"""
307	Print the retrieved data is a simple xml representation of the dict.
308	"""
309	str = "<%s>\n" % self.xml
310	for t in ('node', 'lan'):
311	if d.has_key(t):
312	for x in d[t]:
313	str += "<%s>" % t
314	for k in x.keys():
315	str += "<%s>%s</%s>" % (k, x[k],k)
316	str += "</%s>\n" % t
317	str+= "</%s>" % self.xml
318	print >>out, str
319
320	def __call__(self):
321	"""
322	The control flow. Compose the request and print the response.
323	"""
324	# Process the options using the customized option parser defined above
325	parser = fedd_exp_data_opts()
326
327	(opts, args) = parser.parse_args()
328
329	if opts.trusted:
330	if ( not os.access(opts.trusted, os.R_OK) ) :
331	sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
332
333	if opts.debug > 0: opts.tracefile=sys.stderr
334
335	(user, cert) = self.get_user_info([])
336
337	if opts.cert != None: cert = opts.cert
338
339	if cert == None:
340	sys.exit("No certificate given (--cert) or found")
341
342	if os.access(cert, os.R_OK):
343	fid = fedid(file=cert)
344	else:
345	sys.exit("Cannot read certificate (%s)" % cert)
346
347	if opts.exp_name and opts.exp_certfile:
348	sys.exit("Only one of --experiment_cert and " +\
349	"--experiment_name permitted");
350
351	if opts.exp_certfile:
352	exp_id = { 'fedid': fedid(file=opts.exp_certfile) }
353
354	if opts.exp_name:
355	exp_id = { 'localname' : opts.exp_name }
356
357	req = { 'experiment': exp_id }
358
359	try:
360	resp_dict = self.do_rpc(req,
361	opts.url, opts.transport, cert, opts.trusted,
362	serialize_only=opts.serialize_only,
363	tracefile=opts.tracefile)
364	except self.RPCException, e:
365	exit_with_fault(\
366	{'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
367	except RuntimeError, e:
368	print e
369	sys.exit("Error processing RPC: %s" % e)
370
371	if getattr(self, 'key', None):
372	try:
373	if resp_dict.has_key(self.key):
374	self.print_xml(resp_dict[self.key])
375	except RuntimeError, e:
376	sys.exit("Bad response. %s" % e.message)
377	else:
378	print resp_dict
379
380	class terminate(fedd_rpc):
381	def __init__(self):
382	"""
383	Termination request
384	"""
385
386	fedd_rpc.__init__(self, "Terminate")
387
388	def __call__(self):
389	"""
390	The control flow. Compose the request and print the response.
391	"""
392	# Process the options using the customized option parser defined above
393	parser = fedd_exp_data_opts()
394
395	(opts, args) = parser.parse_args()
396
397	(user, cert) = self.get_user_info([])
398	if opts.trusted:
399	if ( not os.access(opts.trusted, os.R_OK) ) :
400	sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
401
402	if opts.debug > 0: opts.tracefile=sys.stderr
403
404	if opts.cert != None: cert = opts.cert
405
406	if cert == None:
407	sys.exit("No certificate given (--cert) or found")
408
409	if os.access(cert, os.R_OK):
410	fid = fedid(file=cert)
411	else:
412	sys.exit("Cannot read certificate (%s)" % cert)
413
414	if opts.exp_name and opts.exp_certfile:
415	sys.exit("Only one of --experiment_cert and " +\
416	"--experiment_name permitted");
417
418	if opts.exp_certfile:
419	exp_id = { 'fedid': fedid(file=opts.exp_certfile) }
420
421	if opts.exp_name:
422	exp_id = { 'localname' : opts.exp_name }
423
424	req = { 'experiment': exp_id }
425
426	try:
427	resp_dict = self.do_rpc(req,
428	opts.url, opts.transport, cert, opts.trusted,
429	serialize_only=opts.serialize_only,
430	tracefile=opts.tracefile)
431	except self.RPCException, e:
432	exit_with_fault(\
433	{'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
434	except RuntimeError, e:
435	print e
436	sys.exit("Error processing RPC: %s" % e)
437
438	eid = resp_dict.get('experimentID', None)
439	if eid:
440	for id in eid:
441	for k in id.keys():
442	if k == 'fedid': print "%s: %s" % (k,fedid(bits=id[k]))
443	else: print "%s: %s" % (k, id[k])
444
445	class create(fedd_rpc):
446	def __init__(self):
447	fedd_rpc.__init__(self, "Create")
448	def __call__(self):
449	access_keys = []
450	# Process the options using the customized option parser defined above
451	parser = fedd_create_opts(access_keys, self.add_ssh_key,
452	self.add_x509_cert)
453
454	(opts, args) = parser.parse_args()
455
456	if opts.trusted:
457	if ( not os.access(opts.trusted, os.R_OK) ) :
458	sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
459
460	if not opts.project :
461	parser.error('--project is required')
462
463	if opts.debug > 0: opts.tracefile=sys.stderr
464
465	(user, cert) = self.get_user_info(access_keys)
466
467	if opts.user: user = opts.user
468
469	if opts.cert != None: cert = opts.cert
470
471	if cert == None:
472	sys.exit("No certificate given (--cert) or found")
473
474	if os.access(cert, os.R_OK):
475	fid = fedid(file=cert)
476	if opts.use_fedid == True:
477	user = fid
478	else:
479	sys.exit("Cannot read certificate (%s)" % cert)
480
481	if opts.file:
482	exp_desc = ""
483	try:
484	f = open(opts.file, 'r')
485	for line in f:
486	exp_desc += line
487	f.close()
488	except IOError:
489	sys.exit("Cannot read description file (%s)" %opts.file)
490	else:
491	sys.exit("Must specify an experiment description (--file)")
492
493	if not opts.master:
494	sys.exit("Must specify a master testbed (--master)")
495
496	out_certfile = opts.out_certfile
497
498	msg = {
499	'experimentdescription': { 'ns2description': exp_desc },
500	'master': opts.master,
501	'exportProject': { 'localname': opts.project },
502	'user' : [ {\
503	'userID': pack_id(user), \
504	'access': [ { a.type: a.buf } for a in access_keys]\
505	} ]
506	}
507
508	if opts.exp_name:
509	msg['experimentID'] = { 'localname': opts.exp_name }
510
511	if opts.debug > 1: print >>sys.stderr, msg
512
513	try:
514	resp_dict = self.do_rpc(msg,
515	opts.url, opts.transport, cert, opts.trusted,
516	serialize_only=opts.serialize_only,
517	tracefile=opts.tracefile)
518	except self.RPCException, e:
519	exit_with_fault(\
520	{'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
521	except RuntimeError, e:
522	sys.exit("Error processing RPC: %s" % e)
523
524	if opts.debug > 1: print >>sys.stderr, resp_dict
525
526	ea = resp_dict.get('experimentAccess', None)
527	if out_certfile and ea and ea.has_key('X509'):
528	try:
529	f = open(out_certfile, "w")
530	print >>f, ea['X509']
531	f.close()
532	except IOError:
533	sys.exit('Could not write to %s' % out_certfile)
534	eid = resp_dict.get('experimentID', None)
535	if eid:
536	for id in eid:
537	for k in id.keys():
538	print "%s: %s" % (k, id[k])
539
540	class split(fedd_rpc):
541	def __init__(self):
542	fedd_rpc.__init__(self, "Ns2Split")
543	def __call__(self):
544	access_keys = []
545	# Process the options using the customized option parser defined above
546	parser = fedd_split_opts(access_keys, self.add_ssh_key,
547	self.add_x509_cert)
548
549	(opts, args) = parser.parse_args()
550
551	if opts.trusted:
552	if ( not os.access(opts.trusted, os.R_OK) ) :
553	sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
554
555	if opts.debug > 0: opts.tracefile=sys.stderr
556
557	if opts.cert != None: cert = opts.cert
558	else: cert = None
559
560	if cert == None:
561	sys.exit("No certificate given (--cert) or found")
562
563	if os.access(cert, os.R_OK):
564	fid = fedid(file=cert)
565	if opts.use_fedid == True:
566	user = fid
567	else:
568	sys.exit("Cannot read certificate (%s)" % cert)
569
570	if opts.file:
571	exp_desc = ""
572	try:
573	f = open(opts.file, 'r')
574	for line in f:
575	exp_desc += line
576	f.close()
577	except IOError:
578	sys.exit("Cannot read description file (%s)" %opts.file)
579	else:
580	sys.exit("Must specify an experiment description (--file)")
581
582	if not opts.master:
583	sys.exit("Must specify a master testbed (--master)")
584
585	out_certfile = opts.out_certfile
586
587	msg = {
588	'description': { 'ns2description': exp_desc },
589	'master': opts.master,
590	'include_fedkit': opts.fedkit,
591	}
592
593	if opts.debug > 1: print >>sys.stderr, msg
594
595	try:
596	resp_dict = self.do_rpc(msg,
597	opts.url, opts.transport, cert, opts.trusted,
598	serialize_only=opts.serialize_only,
599	tracefile=opts.tracefile)
600	except self.RPCException, e:
601	exit_with_fault(\
602	{'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
603	except RuntimeError, e:
604	sys.exit("Error processing RPC: %s" % e)
605
606	if opts.debug > 1: print >>sys.stderr, resp_dict
607
608	out = resp_dict.get('output', None)
609
610	for line in out.splitlines():
611	print "%s" % line
612
613	class access(fedd_rpc):
614	def __init__(self):
615	fedd_rpc.__init__(self, "RequestAccess")
616
617	def print_response_as_testbed(self, resp, label, out=sys.stdout):
618	"""Print the response as input to the splitter script"""
619
620	e = resp['emulab']
621	p = e['project']
622	fields = {
623	"Boss": e['boss'],
624	"OpsNode": e['ops'],
625	"Domain": e['domain'],
626	"FileServer": e['fileServer'],
627	"EventServer": e['eventServer'],
628	"Project": unpack_id(p['name'])
629	}
630	if (label != None): print >> out, "[%s]" % label
631
632	for l, v in fields.iteritems():
633	print >>out, "%s: %s" % (l, v)
634
635	for u in p['user']:
636	print >>out, "User: %s" % unpack_id(u['userID'])
637
638	for a in e['fedAttr']:
639	print >>out, "%s: %s" % (a['attribute'], a['value'])
640
641	def __call__(self):
642	access_keys = []
643	node_descs = []
644	proj = None
645
646	# Process the options using the customized option parser defined above
647	parser = fedd_access_opts(access_keys, node_descs, self.add_ssh_key,
648	self.add_x509_cert, self.add_node_desc)
649
650	(opts, args) = parser.parse_args()
651
652	if opts.testbed == None:
653	parser.error("--testbed is required")
654
655	if opts.trusted:
656	if ( not os.access(opts.trusted, os.R_OK) ) :
657	sys.exit("Cannot read trusted certificates (%s)" % opts.trusted)
658
659	if opts.debug > 0: opts.tracefile=sys.stderr
660
661	(user, cert) = self.get_user_info(access_keys)
662
663	if opts.user: user = opts.user
664
665	if opts.cert != None: cert = opts.cert
666
667	if cert == None:
668	sys.exit("No certificate given (--cert) or found")
669
670	if os.access(cert, os.R_OK):
671	fid = fedid(file=cert)
672	if opts.use_fedid == True:
673	user = fid
674	else:
675	sys.exit("Cannot read certificate (%s)" % cert)
676
677	msg = {
678	'allocID': pack_id('test alloc'),
679	'destinationTestbed': pack_id(opts.testbed),
680	'serviceAccess' : [ { a.type: a.buf } for a in access_keys ],
681	'createAccess' : [ { a.type: a.buf } for a in access_keys ],
682	}
683
684	if len(node_descs) > 0:
685	msg['resources'] = {
686	'node': [
687	{
688	'image': n.image ,
689	'hardware': n.hardware,
690	'count': n.count,
691	} for n in node_descs],
692	}
693
694	if opts.project != None:
695	if not opts.anonymous and user != None:
696	msg['project'] = {
697	'name': pack_id(opts.project),
698	'user': [ { 'userID': pack_id(user) } ],
699	}
700	else:
701	msg['project'] = { 'name': pack_id(opts.project) }
702	else:
703	if not opts.anonymous and user != None:
704	msg['user'] = [ { 'userID': pack_id(user) } ]
705	else:
706	msg['user'] = [];
707
708	if opts.debug > 1: print >>sys.stderr, msg
709
710	try:
711	resp_dict = self.do_rpc(msg,
712	opts.url, opts.transport, cert, opts.trusted,
713	serialize_only=opts.serialize_only,
714	tracefile=opts.tracefile)
715	except self.RPCException, e:
716	exit_with_fault(\
717	{'desc': e.desc, 'errstr': e.errstr, 'code': e.code})
718	except RuntimeError, e:
719	sys.exit("Error processing RPC: %s" % e.message)
720
721	if opts.debug > 1: print >>sys.stderr, resp_dict
722	self.print_response_as_testbed(resp_dict, opts.label)
723
724	cmds = {\
725	'create': create(),\
726	'split': split(),\
727	'access': access(),\
728	'vtopo': exp_data('Vtopo'),\
729	'vis': exp_data('Vis'),\
730	'info': exp_data('Info'),\
731	'terminate': terminate(),\
732	}
733
734	operation = cmds.get(sys.argv[1], None)
735	if operation:
736	del sys.argv[1]
737	operation()
738	else:
739	sys.exit("Bad command: %s. Valid ones are: %s" % \
740	(sys.argv[1], ", ".join(cmds.keys())))
741

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